Abstract
The average total organic carbon (TOC) content of Chang 91 source rocks is 4.85%, and the main kerogen type is II1, and the average pyrolysis peak temperature is 452 °C in Zhidan-Ansai area, Ordos Basin. These show that Chang 91 source rocks have reached good to excellent level and peak hydrocarbon generation stage. Chang 91 source rocks were formed in semi-deep lacustrine sedimentary environments of fresh-brackish water and weak oxidation-reduction. The discovery of Chang 91 source rock extends the oil exploration field of Yanchang Formation, especially in Zhidan area, it is a favorable area for further exploration in Chang 9 reservoir.
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